Like many developers over the past few months, my daily workflow quietly shifted from typing code manually to orchestrating AI coding agents directly from the command line.
On any given Tuesday, I might have Claude Code refactoring an API endpoint in one terminal pane, Kimi Code writing benchmark scripts in another, and Google Antigravity (Agy CLI) running multi-agent tasks in an isolated git worktree.
They were getting work done. But after a couple of weeks, I had that familiar uneasy feeling every engineer gets when running services without an APM:
What did that 20-minute session actually cost me?
Did prompt caching save me money, or did it miss and re-bill 150,000 input tokens on every turn?
